The Automatic Transfer Switch, located in the Power Station, transfers energy from the Generator when it comes on automatically or when it automatically senses that it needs to come on. It supplies DC Voltage to the batteries and AC Voltage to the house.
The Generator can be turned on manually or there are three different incidences that the Generator turns on automatically: When it senses more than a 60 Amp draw during high Energy requirements, when it senses a drop below a certain Voltage over a 24 hour period of time, or when it senses below a certain Voltage over a 2 hour period of time. When the generator comes on, it automatically charges the batteries.
The Automatic Transfer Switch transfers the power from the generator and it supplies the necessary Voltage to the house and it also charges the batteries at the same time. So it serves a dual purpose of supplying AC Voltage to the house and DC Voltage to the batteries.